Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 188: | \[{15^{188}-1\over14}\] | 25 × 113 × 283 × 659 × 941 × 2351 × 6299 × 22937 × 100957 × 183959 × 2947920462206937499<19> × 140474858446719628685072278249<30> × 400546952025958526341824468624883789<36> × 2656097495066872027407960633754824283<37> × 5159512086757668323198534134160387746601165108891155348450270395721<67> |